New organic photosensitizers incorporating carbazole and dimethylarylamine moieties for dye-sensitized solar cells

Liang, Mao; Wang, Zhongyuan; Zhang, Lu; Han, Hong-Yu; Sun, Zhe; Xue, Song

doi:10.1016/j.renene.2011.03.003

Cited by 22 publications

(11 citation statements)

References 31 publications

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“…The working principle of a DSSC is based on photoelectrochemical process that starts with the excitation of a dye used as photosensitizer by incoming day light and injection of excited‐state electron to the conduction band of a nanocrystalline semiconductor such as TiO 2 . In order to increase the conversion efficiencies, each and every step of photoelectrochemical process is tried to be optimized by various research groups . Optimization of the semiconducting metal oxide film used as photoanode for reducing the number of electron trapping sites and back electron injections to the ground state of the dye serves to improve the overall efficiency.…”

Section: Introductionmentioning

confidence: 99%

N-doped titania powders prepared by different nitrogen sources and their application in quasi-solid state dye-sensitized solar cells

Diker

Varlıklı

Σταθάτος³

2013

Int. J. Energy Res.

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SUMMARY Nitrogen‐doped TiO2 nanocrystalline particles are synthesized by a microwave‐assisted hydrothermal growth method using different amines (Dipropylamine, Diethanolamine and Ammonium hydroxide) as nitrogen sources. Characterization of the nanoparticles was performed with X‐ray diffraction, UV–vis diffuse reflectance spectroscopy, Field Emission Scanning Electron Microscopy and X‐ray Photoelectron Spectroscopy. The prepared N‐doped TiO2 nanoparticles exhibit pure anatase phase with average diameter of 9 nm and reduced optical energy gap compared to undoped TiO2. Immobilization of N‐doped and pure TiO2 nanoparticles on SnO2:F conductive glass substrates was successfully performed by using doctor‐blade technique and paste of the aforementioned nanoparticles. A series of N‐doped TiO2 photoelectrodes with varying N dopant source and concentrations were fabricated for quasi‐solid state dye‐sensitized solar cells. The N‐doped solar cells achieve an overall conversion efficiency ranging from 4.0 to 5.7% while undoped TiO2 showed 3.6%. The basic difference to the electrical performance of the cells is focused to the enhancement in the current density of N‐doped TiO2‐based cells which was from 11% to 58% compared with undoped TiO2 cells. Current densities were directly proportional with nitrogen doping level in TiO2 lattice which differs depending on the amine source nature such as basicity differences, hydrogen bonding abilities and steric inherences. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

N-doped titania powders prepared by different nitrogen sources and their application in quasi-solid state dye-sensitized solar cells

Diker

Varlıklı

Σταθάτος³

2013

Int. J. Energy Res.

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“…In particular, the attainment of stable blue electroluminescence with high efficiency, good color purity, and stability remains a challenge in both fluorescent and phosphorescent materials. In an attempt to circumvent these problems, various π-conjugated organic materials have been explored as blue emitters to improve the efficiency and stability of OLEDs [9].…”

Section: Introductionmentioning

confidence: 99%

Design and Synthesis of Novel Organic Luminescent Materials Based on Pyrazole Derivative

Duan

Zhao

Yang

et al. 2019

Journal of Heterocyclic Chem

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Five new materials based on pyrazole derivatives have been synthesized and characterized as organic light‐emitting devices. This report presents a novel approach to combine pyrazole with aromatic hydrocarbons via methylene. The formed molecules exhibited twisted structures, which resulted in high glass transition temperatures (Tg), which ranged from 83.0 to 101.1°C. They also had high optical band gaps (Eg); most of their optical band gaps are determined by the absorption edge technique as 3.43 to 3.66 eV, evaluated photophysical properties of these synthesized novel chromophores, the optical properties such as maximum absorption and emission wavelengths (λ; nm), molar extinction coefficients (ε; cm−1·M−1), Stokes' shifts (ΔλST; nm), and quantum yields (φF). These compounds exhibited intense absorption bonds between 230 and 350 nm, and the effect of solvent polarity on emission of these pyrazole derivatives was also studied. In addition, they showed blue fluorescence in different solvents and bathochromic shift with the increase in the solvent polarity.

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“…Carbazole derivatives have shown particular promise as electron donating moieties in DSCs, providing efficient charge separation in D–π–A systems . Furthermore, derivatization of the carbazole moiety can be used to realize bulky, nonplanar donor architectures that address the problem of close π–π aggregation of dye molecules .…”

Section: Introductionmentioning

confidence: 99%

Theoretical rationalization for reduced charge recombination in bulky carbazole‐based sensitizers in solar cells

et al. 2017

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The search for greater efficiency in organic dye-sensitized solar cells (DSCs) and in their perovskite cousins is greatly aided by a more complete understanding of the spectral and morphological properties of the photoactive layer. This investigation resolves a discrepancy in the observed photoconversion efficiency (PCE) of two closely related DSCs based on carbazole-containing D-π-A organic sensitizers. Detailed theoretical characterization of the absorption spectra, dye adsorption on TiO , and electronic couplings for charge separation and recombination permit a systematic determination of the origin of the difference in PCE. Although the two dyes produce similar spectral features, ground- and excited-state density functional theory (DFT) simulations reveal that the dye with the bulkier donor group adsorbs more strongly to TiO , experiences limited π-π aggregation, and is more resistant to loss of excitation energy via charge recombination on the dye. The effects of conformational flexibility on absorption spectra and on the electronic coupling between the bright exciton and charge-transfer states are revealed to be substantial and are characterized through density-functional tight-binding (DFTB) molecular dynamics sampling. These simulations offer a mechanistic explanation for the superior open-circuit voltage and short-circuit current of the bulky-donor dye sensitizer and provide theoretical justification of an important design feature for the pursuit of greater photocurrent efficiency in DSCs. © 2017 Wiley Periodicals, Inc.

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New organic photosensitizers incorporating carbazole and dimethylarylamine moieties for dye-sensitized solar cells

Cited by 22 publications

References 31 publications

N-doped titania powders prepared by different nitrogen sources and their application in quasi-solid state dye-sensitized solar cells

N-doped titania powders prepared by different nitrogen sources and their application in quasi-solid state dye-sensitized solar cells

Design and Synthesis of Novel Organic Luminescent Materials Based on Pyrazole Derivative

Theoretical rationalization for reduced charge recombination in bulky carbazole‐based sensitizers in solar cells

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